Mercurial > octave-antonio

annotate scripts/statistics/distributions/chi2pdf.m @ 11472:1740012184f9

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Use uppercase for variable names in error() strings to match Info documentation. Only m-files done.
author Rik <octave@nomad.inbox5.com>
date Sun, 09 Jan 2011 21:33:04 -0800
parents e00de2d5263c
children fd0a3ac60b0e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
7017
a1dbe9d80eee [project @ 2007-10-12 21:27:11 by jwe]
jwe
parents: 7016
diff changeset
1 ## Copyright (C) 1995, 1996, 1997, 2005, 2006, 2007 Kurt Hornik
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
2 ##
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
3 ## This file is part of Octave.
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
4 ##
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
5 ## Octave is free software; you can redistribute it and/or modify it
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
6 ## under the terms of the GNU General Public License as published by
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6859
diff changeset
7 ## the Free Software Foundation; either version 3 of the License, or (at
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6859
diff changeset
8 ## your option) any later version.
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
9 ##
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
10 ## Octave is distributed in the hope that it will be useful, but
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
13 ## General Public License for more details.
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
14 ##
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
15 ## You should have received a copy of the GNU General Public License
7016
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6859
diff changeset
16 ## along with Octave; see the file COPYING. If not, see
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe]
jwe
parents: 6859
diff changeset
17 ## <http://www.gnu.org/licenses/>.
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
18
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
19 ## -*- texinfo -*-
10680
e00de2d5263c Replace calls to obsolete chisquare_cdf with chi2cdf.
Rik <octave@nomad.inbox5.com>
parents: 7017
diff changeset
20 ## @deftypefn {Function File} {} chi2pdf (@var{x}, @var{n})
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
21 ## For each element of @var{x}, compute the probability density function
5482
6bbfc37975d2 [project @ 2005-10-04 17:17:21 by jwe]
jwe
parents: 5410
diff changeset
22 ## (PDF) at @var{x} of the chisquare distribution with @var{n} degrees
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
23 ## of freedom.
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
24 ## @end deftypefn
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
25
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
26 ## Author: TT <Teresa.Twaroch@ci.tuwien.ac.at>
5482
6bbfc37975d2 [project @ 2005-10-04 17:17:21 by jwe]
jwe
parents: 5410
diff changeset
27 ## Description: PDF of the chi-square distribution
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
28
5482
6bbfc37975d2 [project @ 2005-10-04 17:17:21 by jwe]
jwe
parents: 5410
diff changeset
29 function pdf = chi2pdf (x, n)
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
30
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
31 if (nargin != 2)
6046
34f96dd5441b [project @ 2006-10-10 16:10:25 by jwe]
jwe
parents: 5482
diff changeset
32 print_usage ();
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
33 endif
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
34
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
35 if (!isscalar (n))
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
36 [retval, x, n] = common_size (x, n);
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
37 if (retval > 0)
11472
1740012184f9 Use uppercase for variable names in error() strings to match Info documentation. Only m-files done.
Rik <octave@nomad.inbox5.com>
parents: 10680
diff changeset
38 error ("chi2pdf: X and N must be of common size or scalar");
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
39 endif
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
40 endif
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
41
6859
5fddcbbe880e [project @ 2007-09-04 12:59:42 by dbateman]
dbateman
parents: 6046
diff changeset
42 pdf = gampdf (x, n / 2, 2);
5410
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
43
56e066f5efc1 [project @ 2005-07-13 17:43:35 by jwe]
jwe
parents:
diff changeset
44 endfunction